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reply question 2：using the GW calculation to estimate the true band gap.

Dear aromero,

Thanks for your comment! Could you give us the website that can download Matteo Giantomassi thesis?

Dear ABINIT users: Using the Optic to calculate semiconductor dielectric function, epsilon, it always showed small negative imaginary (epsilon2) value at the low imput energy between 0 to 1.0eV. It should be equal zero when the input energy approach to 0eV. Is there any way to resolve this problem? ...